DIAGENETIC FABRICS OF THE CENOMANIAN-TURONIAN CARBONATE ROCKS IN EAST CENTRAL SINAI, EGYPT. AHMED M. ELSHISHTAWY, ABD ELMONEIM T. ABD ELMAMEED, ANTAR A. ABD ELWAHAB1 and AZIZ M. ABU SHAMA1 Geol. Dept. Fac. Sciences, Tanta Univ., Tanta I  Fac. Education, Kafr ElSheikh, (Tanta Univ.), Egypt Several diagenetic features have been recorded from the Cenomanian-Turonian carbonates (the Galala and Wata Fms) in the Thamad (Themed) are east central Sinai, Egypt. These include micritization, neomorphism, replacement, cementation. compaction, dolomitization and dedolomitization. Dolomitization is the most common diagenetic process that yielded many types of dolomite. The different types of dolomite indicate variable mechanisms: marine dolomitization, mixing-zone dolomitization, organogenic dolomitization and dolomitization due to pressure solution adjacent to stylolites. Surface dedolomitization is a common diagenetic process in the dolomitic limestones of both Galala and Wata Fms but it is very rare or disappeared in the dolostone beds. Subsurface dedolomitization is recorded in the dolomitic limestone of the Galala Fm. The presence of authigenic feldspars in carbonate rocks has also recorded in this study from the carbonate rocks of the Wata Fm